Hyperdrive?

Did you by chance have the speed limit mega event? Sounds like it that's what happened.

I cant recall that happening... I suppose I can look back in the event log?

That sounds like the event he's describing. It's a real kick in the nuts on a large map...

I did some digging and way back in the beginning I recal this happening....

[SubSpaceTear] The commitee on Regulating Potentially Dangerous Technology has actually presented us with hard evidence of a serious problem: sub space tears are starting to form across the galaxy, caused by high speed engine techologies. The only solution is to limit all ships to moving no faster than %lu parsecs per week. The alternative does not bear thinking about.

-A Galactic speed limit. The AI will still trade for and research engine tech that is above the "speed limit" though.

Is there a cure for this? Will it expire?

I'm playing on the immense map and its tear jerking waiting for a troop ship to arrive....

Sorry, you will have to live with it for the rest of that game. The best bet for you now is to just remove the engines and you should have enough passive bonuses to hit a speed of 5.

Start putting starports on all planets to save on time to get ships to places by building closer to the front.

Also, use your own planets as slingshots to gain another 2 parsecs of movement. If you are going near a planet, enter it's orbit (costs 0 movement to enter orbit) then switch the exit parsec for the planet to the direction your headed, then exit the planet (costs 0 movement). You just increased your speed by 40% by doing this. If used in a system with many planets, you can have tons of movement points to add.